Then you set up the "white list" - meaning the list of good destinations that you want to allow.
What you describe is called "whitelisting" - meaning that you set up 1 rule on a firewall that says "block everything" (deny all any/any where "deny" = don't let anything through, all = all types of traffic, any/any - any source, any destination). There's certainly different brands out there, and if you are a novice user, you may want to read reviews on usability before buying and take a serious look at screen shots. My pick would be for you to get a desktop firewall.
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